Combined radio and phonographic recording and reproducing system



July 10, 1928. 1,676,491 P. GOLDSBOROUG'H v COMBINED RADIO" AND PHONOGRAPHIG RECORDING AND BEPRODUCING SYSTEM Filed Sept. 16; 1926 2 Sheets-Sheet '1 ud. Speak: r

Recorder- 2 Sheets-Sheet 2 P. GOLDSBOROUGH Filed Sept. 16, 1926 1 0/6 fo r Pau/ 60/0491 0 re COMBINED RADIO AND PHONOGRAPHIC RECORDING AND REPRODUCING SYSTEM July 10, 1928'.

Patented July 10, 1928.

UNITED STATES PATENT OFFICE.

ALBERT 1?. UPTON, OF MINNEAPOLIS, MINNESOTA.

COMBINED RADIO'AND PHONOGRAPHIC RECORDING'AND REPRODUCING SYSTEM.

. Application filed September 16, 1926. Serial No. 135,860.

My invention provides an improved system, apparatus or device in which a radio receiving set, phonograph and record-recording means are combined in a unitary scheme, whereby the system may be used (a) as an ordinary radio receiving set, (7)) as a radio recording or record-producing means and,'at the same time, if desired, as

a radio receiving set, and (c) as a phonograph in which certain parts of the radio receiving set, such as the amplifier, the A and B batteries, are utilized for increasing the volume produced from the phouographic record.

The invention is illustrated in the accompanying drawings, wherein like characters indicate like parts througlumt the several views. i

Referring to the drawings: 'Fig. l is a diagrammatic view illustrating the electrical system: and the loud-speaker recorder is also diagramn'iatically illustrated. Obviously the recording means will extend adjacent the record blank as is clearly shown in Fig. 2.

Fig. 2 indicates a double cabinet within which or on which the main elements are installed.

The system as diagrammatically illustrated in Fig. 1 will first be described:

The high frequency receiving set may in volve any of the well known or operative circuits, but for illustration I have shown a two-stage radio frequency amplifier with a non-regenerative detector. Certain .of the elements of this system may be briefly noted as follows: The numeral 3 indicates a receiving conductor, such as an antenna-circuit, the numerals 4 indicate the usual radio frequency amplifiers, the numeral 5 the detector or rectifier, the numeral 6 the audio amplifier, the numeral 7 the loud speaker or reproduccr, such, for example, as the standard cone type, the numeral 8 the tery, the numeral 10 the C battery.

In carrying out my invention, I employ a microphone 11 that is electrically connected to the primary 12 of a microphone transformer by leads 13 that lead to the A battery 8 from which they are energized. The secondary 14 of the microphone transformer is connected by wires 15 to the terminals 16 of a double-pole double-throw switch 17.

A battery, and the numeral 9 the B loat' The contact blades of the switch 17 are con-- nected by wires 18, as shown, to the primary of the first audio transformer 6. Tlhelflades of said switch 17 are movable at will into en gagemcnt with the correspondingly aligned terminals 16 or with switch terminals 19, which connect to the output of the detector of the radio set proper. When the system is to be used as a radio receivingset, the

blades of the switch 17 will be moved into engagement with the aligned switch ter minals 19. r

The numeral 20 indicates the rotary table of a phonograph, which latter may be of "any approved or suitable construction operated either mechanically or electrically. 'lhe numeral 21 indicates a disc placed on the table 20. 'lhc numeral 22 indicates a tone arm to which is connected an ordinary phonograph reproducer 23 having the customary needle 24. The tone arm 22, re-

produccr 23 and needle 24 are a; be used inv connection with the disc 21 for reproducing 4 include variable condensers 4 and that the detector 5 includes a variable condenser 5. The numerals 26 and 27 indicate rheostats connected in the. A battery circuits and serving, respectively, to control the filament temperatures of the radio amplifier and detector tubes. The numeral 28 indicates the main A battery control switch, and the numeral 29 indicates the microphone control switch. The numeral 30 indicates a rheostat from the A battery lead controlling the filament temperatures of the audio amplifiers 6.

The cabinet 31 shown in Fig. 2 has two compartments in which, as shown, the radio elements are placed in the right-hand compartment and the left-hand compartment. The turntable 21 of the phonograph'and the operating mechanism, therefgre, are mounted on the left-hand compartment of the cabinet 31 substantially in the manner of an ordinary phonograph. Further carrying out this scheme, the loud speaker 7 is located in the cabinet below the turntable and the cabinet is formed with a forwardly conrecording element.

verging sound channel 32 that opens at the front of the cabinet and with a rearwardly converging sound channel 33 that leads to the tone arm 25. It may be now stated that the tone arm 25, which is used in the production of permanent records, is provided with a needle 34 of a proper character to cut the record groove in the disc or other Operation.

is placed on the table and the driving,

me hanism for rotating the turntable is then started into action. Then the head of the" tone arm is moved so as to properly posi-' tion the cutting needle 34 on the blank disc This recording action requires some means for progressively moving the needle 34- toward .the axis of the table, but assuch mechanism is well known and now in general use in record-] )roducing machines, detailed description or further illustration thereof is not thought necessary. It is obvious that by the means indicated, permanent records can be readily produced from anything picked up by the radio set and reproduced in the loud speaker 7. The sound produced by the loud speaker in the arrangement illustrated will be transmitted through the channel 33, tone arm 25, and its diaphragm, to the needle 34, thereby causing the needle to cut or form the proper record groove. At the same time this permanent record is being produced, sound will be or may be projected through the sound passage 33 and heard as from a phonograph but with increased volume, due to the loud speaker and amplifier.

When the system is to be used simply as a phonograph for the production of sound from-a permanent record, the blades ofthe switch 17 will be moved into engagement with the switch terminals 16 and this will cut the radio receiving set out of action but will arrange the A and B and G batteries, the amplifier 6, the microphone 11 and the microphone transformer 14 for connection 1n operative circuits when the switches 28 and 29 are closed. When thus coupled, the sound vibrations will be taken from the record and reproduced with increased vol ume that may be controlled by adjustments of the rheostat 30.

It will be understood that the microphone, the mlcrophone transformer, the amplifier. the phonograph instrument and the type of radio receiving set shown in the drawings may take various diil'erentforms and that the invention resides in the combination or cooperative association of the several instrumentalities or devices,regardless of their specific forms.

With a system such as illustrated, it is obvious that at any time, by simple adjustments of the controlling devices, the system may be converted from any one to the other of its several possible uses. For instance, in the ordinary use of the radio receiving set, if an announcement is made of a record that the listener wishes to record or convert into a permanent record, this may be quickly done by the application of the proper blank disc to the turntable or phonograph and by throwing the tone arm 22 out of action and 'the tone arm 25 into action, as previously more fully described.

What I claim is:

1. An apparatus of the class described, comprising a radio receiving set. an electrical reproducer. for phonograph records, an audiofrequeney amplifier, electric circuit-s connecting said amplifier with the aforesaid devices, a loud-speaker electrically connected to the output of said amplifier, phonograph record recording means, and-means operatively connecting said loud-speaker and said recording means whereby sound produced by the loudspeaker maybe simultaneously heard and recorded.

2. An apparatus of the class described, comprising a radio receiving set, an electrical reproducer for phonograph records, an audio-frequency amplifier, electric circuits connecting said amplifier with the aforesaid devices, a loud-speaker electrically connected to the output of said amplifier, phonograph record recording means, and acoustical means connecting said loud-speaker and said recording means whereby sound produced by the loud-speaker may be simultaneously heard and recorded.

3. A device of the class described, comprising a radio receiving set, an electrical reproducer for phonograph records, an audio-frequency amplifier common to said reproducer and receiving set and switch mechanism for connecting said amplifier for operation with either, a cabinet in which said apparatus is mounted, an open sound chamber in said cabinet, a loud-speaker electrically connected to the output of said amplifier and mounted in said sound chamber, and a phonograph record recording means carried by said sound chamber whereby sound produced by theloud-speaker may be simultaneously heard and recorded.

In testimony whereof I affix'mysignature.

PAUL GOLDSBOROUGH 

